Nitrogen Cycling in the Americas: Natural and Anthropogenic Influences and Controls

Sources of reactive nitrogen affecting ecosystems in Latin America and the Caribbean: current trends and future perspectives.- A review of anthropogenic sources of nitrogen and their effects on Canadian aquatic ecosystems.- More is less: agricultural impacts on the N cycle in Argentina.- Human activities changing the nitrogen cycle in Brazil.- Assessment of nitrogen flows into the Cuban landscape.- Urban influences on the nitrogen cycle in Puerto Rico.- Nitrogen and phosphorus budgets for a tropical watershed impacted by agricultural land use: Guayas, Ecuador.- The influence of climate on average nitrogen export from large watersheds in the Northeastern United States.- Coastal eutrophication assessment in the United States.- Nitrogen cycling in tropical and temperate savannas.- Nutrient-chlorophyll relationships in tropical-subtropical lakes: do temperate models fit?.- The stable carbon and nitrogen isotopic composition of vegetation in tropical forests of the Amazon Basin, Brazil.